Stop-motion device



W. S. MILLS'AND H. E. BISAILLON.

STOP MOTION DEVICE.

APPLICATION r|LED 1uNE1|,192.

9424 @44, v Pateted Aug. 85, 1922.

s'QsHEETs-SHEET l.

w. s. IvIILLs AND ILE. BISAILLOII.

STOP MOTION DEVICE.

APPLICATION FILED IIINE II. `1921.

LQB@ I Patented Aug. 8, 1922.

3 SHEETS-SHEET 2.

W. S. MILLS AND H. E. BISAILLON.

STOP MOTION DEVICE.

APPLICATION FILED JUNE II, 192|.

Patented Aug. 8, 1922.

3 SHEETS-SHEET 3.

U 1 i E T .L

WlLLIAM'S. MILLS, OIF TRUMBULCL, AND HECTOR BISAILLON, 02E` BRJIDGEPORT,

' CONNECTICUT.

srorrno'rionnnvion. c

Application filed June ,11,

To all whom t may concern; v

Be it' known that we, VILLIAM'S. Minne and HECTOR E. BIsAILLoN, citizens ofthe United States, residing,j respectively, aty Trumbull .and Bridgeport, in theconnty oiti Fairfield and State ofConnecticnt, haveinvented or discovered certain new, and tuseful. improvements in, Stop-,Motion ,De v1ces,A ot'l which the following is aspeciiication, reference being had therein to the,accoinpanyng,v

drawings.

This invention relates to a stopmotion device tor sewing. machines or the l1ke' and comprises certain improvements on the stop the machine is .next started, such tilting causing the brake. shoeto be somew hat1in. frictional contact `A therewith, such frictional contact being sniiic1ent, 1n somev instances, to

causevheating of the fly-wheel, thus resulting in some loss ofpower aswell asinconveniencetothe, operatorvwho may wish to place her hand on the wheel, which sometimes gets unpleasantly hot In accordance with thepresent invention this result is prevented by a stopwhich will preventvtilting movement oi'V the pivoted brakeL shoewhen the machine is started.

Also in the construction shown in our,v last-named patent the stopping lever which v carries the brake shoe is acted on byaspring which releases the brakefshoeand moves the'k said lever towards its operating cam. In4

the present improved construction the said lever is positively operated in botlifdired tions to withdraw the brake` shoe from contactfwith the fly wheel and also to force said shoe in contact with said fly-wheel, as will hereinafter more` fully appear.

Also in the construction shown in ouri last-namedlpatent the upperthread guides which hold the threads in proper positions to directthethreads intothe slitsl of the tripping levers comprise plain holes through the Vthread guide plates. is running rapidly-and the thread ispassing swiftly through,thesaid threadguide. holes kinks will sometimes occur',y in the Specification of Letters Patent..v

, .fly Wheel, tostop themachine, is liableto beftiltled bythe rotation oi' the fly-wheel, Vwhen the said brake shoe isreleased from vthe fly-wheel andk When the, machineA Patented Ang. 8, 1922.

1921. j serial No. 476,824.

thread, thus ,Y endangering the breakage of theflatterg. The present construction comf prisesthread guide consistingof a taperinguhvollow part or trumpet whichwill serve @11.17, in. the thread` Passing tothe ,Slitted t'rpr pingarm or lever;4 a pluralityoil thesektapering hollow parts or trumpets being pro vided vin casethe invention isto b eus'ed in connection with a multiple sewing machine.Y

In the accompanying drawings` Fig.V 1V is an elevation ofthe improved st opfmotion device Fig. 2 is an end view of thesarne looking. from the 1e ft,.Fig.Y 1. Fig. 3 is a planview of the improved stopjmotion clevice, Fig.n i is a sectional elevation, looking from the right, Figs.. 1 and 3, and Fi `isv a detail view of thetripping rock-sha t and connected parts.

Referring to the drawings, 12v denotesa bracket or support which'may beattached to a work bench conveniently adjacent toa4 sewing machine in connection with which the improved stop` motiondevice isto be used', said bracket having uprights 13 'and 1 4, affording bearings for a rock-shaft 15 prof` vided at its orwardend, inside of the. up right 13, with an arm 16 having at :its upf per end a pin 17 engaging the lower endof a `latch-lever 18 .pivoted to said upright `13 and having a bevelled or rounded upper end adapted to be engaged by a vtinger 21 on a holding` latch 22 carried by a tripping rock-v yshaft 23 journalled in bearings atforded byi the upwardly projecting lugsf24. at the upper end of the upright' 13. The latch-,lever 18 is providedat its'lower end with -`an inclined nger 19 rearward of which isa lng 20 affording a notch arranged to be entered by the pin 17 on the armv 16 of the rockshaft 15, as in the construction shown and' described in our Patent No. 1,380,003, ofMay 31,1921.

The tripping rockshaft 23,'in theforrn of the invention herein shown, carries a single tripping arm 26, having a narrow slit 28 permitting the free passage of the thread i but not of knots or lumps inthe. thread, so,v that said trapping arm will be tripped or moved downwardly slightly when engaged by a knot or lump, in the thread. The slit 28 has a V-shaped or inwardly tapering open end 29 which serves to facilitate the entrance of the threadf-in said slit, and whichalso serves, in conjunction with the threadguides 30 and 31, arranged on opposite sidesjof' saidy tripping -arm,vto permit theescape ofV the .knots or lumps from the trippingarm j held in any desired positionof adjustment byf a lock-nut 34. This holding of the latch 22 against the top ofthe pin 32 is effected by the coil spring connected at its upper end to la hooked arm 36 on the rock-shaft 23 and connected at its lower end to a lug 37 on a bracket 38 'adjustably attached to the upright 13 by a set screw 39 passing through a slot in said bracket. y

The upper or entering thread lguide 30 consists of a hollow, interiorly tapering part or'trumpeit which will serve to straighten' anykinksywhich may occur in the thread rapidly passing to the slitted tripping arm 26, ,thus` avoidingl breakage of the thread from this cause. This upper thread guide iscarriedby an arm 40 having a lhooked lowerend affording a slot by which the said arm may be adjustably attached to the upright vr13 by a set screw 41, such attachment V permitting the said arm to be adjustable bothflongitudinally and axially. Similarly,

theithread guide 31 is carried by an arm 42'v also vhaving a hooked lower or inner end affordinga slot vby which the said arm is adjnstably attached to the upright 13 by a. set screw/43 which also affords longitudinal andaxial adjustments of the said thread guidearm. This construction affords double adjustments ofthe said thread guides, in

, thel Vconstruction set forth in our patent of 31, 1921, but bysimpler means.

The rockshaft 15 is provided atits rear end with an arm 44 formed integral with the setting handle 45 which is attached to lsaid'rock shaft by a set screw 46. The arm 44 carriesa pin 47 entering a slot in the long arm` of a lever 48 pivotally mounted in a yoke 49 :having a threaded shank 50 which is tappedin a lug 51 on a plate 52 which isto be attached to the sewing machine table or work bench beneath theJ driving or power shaft 53V of the sewing machine, said power shaft carrying a ily-wheel 54having an integral grooved pulley portion 55.` The yoke 49 fis heldin any desired position of adjustment by a lock nut 56 ron the threaded shankV 50 of the said yoke. Pivotally mounted on the short arm of the lever 48 isa brakeshoex?, of usual4 construction, which isarra'nged closely adjacent to the grooved pulley portion 55 of the fly wheel 54 so that when, the latch lever 18 is released from" the finger 21 on the holding latch 22 the rockshaft 15 will be turned by thetorsional coil spring 58 thereon, thus causing. the lever 48 to be operated to force the brake shoefinto contact with the grooved pulley portion of the fly-wheel by the stress of said torsional spring, and therebyl stopping ,the machine. The driving or power shaft 53 is drivenby a light belt running over the grooved pulley 55, and the stress of the spring 58 is suflicient to overcome ,the frictional holdl of said belt von said pulley, sothatfthe belt, which in practice is run rather loose,vwill slip on the pulley 55 when the machine is stopped. spring 58 is connected at one end to the up right 14 and is connected at its other end toa collar 15a attached to the rock shaft 15,`

This collar,lwhen its holding set screw is loosened, maybe turned on the shafty 15 to give the spring 56` any desired stress or tension.'

The torsional When the brake shoe Vis released from the 'Y fly wheel pulley and the machine is started, with the fly wheel running in the direction noted by the arrow in Fig. 2, the running' fly wheel pulley 'wll'have a tendency totilt the said brake shoe 4in such, a mannery that some portion thereof may be in contact with" the said g'roovedv pulleyportion ofthe iiy wheel from which it had been released when" f theY parts were .resetj before starting the machine. To prevent' this tilting movement ofthe brake shoe4 a curved stop arm or 'wire 59, attached fat one end to the lug 51 on the i plate 52 is provided,I the outer end of said arm being 'in contact'with vor closely adjacent tothe lower side of the brake shoe when the latter is released from the grooved pulley part ofv the Vily-wheel. Thus' any tilting of thebrake shoe which might cause some part thereof tobe in frictional contact with the running grooved pulley part of the flywheel will be prevented by said stop.

vThe tripping arm 26 and the holding arm 22v are both attached to the tripping rockshaft 23 by a set-.screw 2,7, andas said arm and'latch are arranged betweenv and closely adjacent the lugs 24 in which said rock shaft is mounted they will prevent endwise movement of saidrockshaftin its bearings.

Inthe operationlof this device when a knot orflumpin ,the thread engages the slitted tripping'arm 26 the saidtripping arm will be moved to the right, looking at Fig. 2, thus also moving the holding latch 22 connected with the saidtr-ipping arm through the tripping rock-shaft' 23 andthereby rei leasing the finger -721v on the said-holding latch 22 from the latch-lever 19, thus releasing said, [holding latch and permitting thetorsional spring 58v` to turn the rock shaft 15 to force the'y brake shoe into con-`I tacti with the grooved pulley portion of the'v fly wheel to stop the machine,the said latchlever being bythisv y'operation moved by the'llSO pin 17 on the arm 16 of the said rockshaft 15 to the position indicated by dotted lines in Fig. 2. When the parts are to be reset after stopping the machine the handle 45 on the rockshaft 15 is lifted from the position shown in dotted lines in Fig. 2 to the position shown in full linesv in said ligure, and in this operation the pin 17 will engage theI finger 19 at the lower end ofthe latch lever 18, thus returning said latch-lever to its normal position in engagement with linger 21 on the holding latch 22. In this resetting movement the yielding holding latch 22 will be lifted slightly by the rounded or bevelled upper end of the latch-lever 18 to permit said end to pass by the finger 21.

From the foregoing it will be understood that the present invention provides certain improvements on the stop-motion devices of our patents hereinbefore referred to by which the construction of the parts is simplified and certain objections heretofore existing are remedied.

Having thus described our invention we claim and desire to secure by Letters Patent:

1. In a stop-motion device, the combination with a power shaft provided with a wheel to which a brake may be applied, of a tripping mechanism comprising a spring-actuated rock-shaft, a setting handle attached to said rock-shaft and having an arm provided with a pin, a bracket supporting said rock-shaft, a lever having a slot entered by said pin, a brake device carried by said lever and arranged to act on said wheel, a latch-lever mount-ed on said bracket and operatively connected with said rockshaft, a spring-held tripping rockshaft supported by said bracket and carrying a holding latch having a finger normally engaging said latch-lever and holding the stop-motion device inactive, a tripping arm carried by said tripping rock-shaft and provided with a narrow slit permitting free passage of a thread, but adapted to be tripped by knots or lumps in the thread to release said latch from said latch-lever and thus render the stop-motion device operative to apply said brake device positively to said wheel on said power shaft.

2. In a stop-motion device, the combination with a power shaft provided with a wheel to which a brake may be applied, of a tripping mechanism comprising a springactuated rock-shaft, a setting handle attached to said rock-shaft and having an arm provided with a pin, a bracket supporting` said rock-shaft, a lever having a slot entered by said pin, a brake shoe having a pivoted connection with said lever and arranged to act on said wheel, a support for said lever, a curved stop arm-mounted on said support and having its upper end closely adjacent to said brake shoe to prevent the said shoe from tilting when the said wheel is started, a latch-lever mounted on said bracket and operatively connected with said rock-shaft, a spring-held tripping rock-shaft supported by said bracket and carrying a holding latch having a finger normally engaging said latch-lever and holding the stop-motion device inactive, a tripping arm carried by said tripping rock-shaft and provided with a narrow slit permitting free passage of a thread, but adapted to be tripped by knots or lumps in the thread to release said latch from said latch-lever and thus render the stop-motion device operative to apply said brake device positively to said wheel on said power shaft.

3. In a stop-motion device, the combination with a power shaft having a fly wheel provided with a grooved pulley, of a brake shoe adapted to engage said grooved pulley, a lever with which said brake shoe is pivotally connected, a support for said lever, an arm mounted on said support with its upper end closely adjacent said brake shoe to prevent tilting movement of the said brake shoe when released from said pulley and said wheel is started, means for holding said brake shoe out of contact with said driving pulley,` positive means for forcing said brake shoe into contact with said driving pulley when said holding means are released, and tripping means for releasing said holding means, said tripping means comprising an arm having a slit permitting passage of the thread but which arm will be tripped by a lump or knot in the thread to release said holding means, thus permitting said brake shoe to be forced into contact with said pulley by said forcing means.

4l. In a stop-motion device for sewing machines, the combination with a power shaft and a brake device to act on said shaft, of an operating mechanism for holding and releasing said brake device, said operating mech* anism comprising a tripping rock-shaft, an upright having lugs at its top in which said rock-shaft is mounted, a tripping arm fixed to said rock shaft and having a narrow slit for the passage of the thread, said tripping arm being adapted to be tripped by lumps or knots in the thread, and a holding arm also attached to said rockshaft, said' arms being between and closely adjacent to said lugs and thus serving to hold said rockshaft in place against endwise movement.

In testimony whereof we aflix our signatures.

WILLIAM S, MILLS. HECTOR E. BISAILLON. 

